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The laser interferometer configuration shown above provides a known optical input on a solid-state imaging device independent of any other component in the optical system.
English (United States)
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Solid State Imaging Device Modulation Transfer Function Measurement
The laser interferometer configuration shown above provides a known
optical input on a solid-state imaging device independent of any other component
in the optical system.
Referring to the drawing, the interferometer comprises a laser 1 whose
coherence length should be at least one meter, beam splitters 2 and 5, a CCD
(charge-coupled device) imaging device 6, and totally reflecting mirrors 3 and 4,
each with two degrees of angular control. In addition, mirror 4 is mounted on a z-
translatable stage. In operation, the beams in each interferometer leg are
combined at an angle Theta to form a sinusoidal intensity pattern at 6. By
translating mirror 4 and recombining the beams at a new angle, control is
maintained on the spatial frequency of the interference pattern at 6.
When two plane waves of intensity I1 and I2 interfere, vertical sinusoidal
fringes are formed so that the resulting intensity I(Delta) is I(Delta) = I(1) + I(2) +
2 Square Root I(1) Square Root I(2) cos Delta where Delta is the relative phase
between I1 and I2. The spatial frequency V of I(Delta) is V = 2/Lambda sin
Theta/2 (2) where Lambda is the wavelength of the laser radiation. When the
perpendicular of array 6 bisects Theta, Delta becomes 2 Pi Vx, where x is the
linear coordinate along the length of photodiodes at 6. Equation (1) becomes I(x)
= I(1) + I(2) + 2 Square Root I(1) Square Root I(2) cos2 pi Vx (3...